Rotors - what price should i expect to pay for a pair of slotted rotors for the front of an EF with ABS???

Shocks - I have superlow king springs and Monroe GT shocks at the moment. I want to put a new pair of rear shocks in cause the GT's are short enough and one of the rear springs pops out on occasions. What would be the best shocks to get and what prices??? I was thinking maybe some 3/4 Konis.

my car has been lowered 2" with kings and i have GT monroes and the only time the spring pops out is when i take it to get repair work done and the mecanics dont put them into the rubbers properly they just let the car down with out checking.